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Your best bet here is to go to the dealer or a reputable tune up shop and see if they will provide you with wiring diagrams for both years. If you explain your predicament, they will most likely give them to you.They don't like to tackle these kinds of jobs. Then you will have to go through them to see what is different.That is the only way to solve this problem.
Every year there are changes in the details with wiring harness and it's probable that you may have to change the position of some wires going into or out of the computer. Trace out the circuit on both diagrams and reconfigure the 89 harness to match the contact points and routing obf the 90 and you should be able to get your wipers working properly and your gauges to stop flashing. Hope this helps.